Method For Soldering Composite Material Parts

Abstract

The invention relates to a method of brazing together two parts ( 10, 20 ), the method being characterized in that a pad ( 30 ) is interposed between the two surfaces (S 10, S 20 ) of the parts that are to be joined together, said pad being formed by a refractory fiber texture, and being at least in part in contact with a brazing composition ( 40 ), and heat treatment is performed to liquefy the brazing composition ( 40 ) so as to cause the molten brazing composition to be distributed by capillarity over the entire brazing area between the two parts ( 10, 20 ) covered by the pad ( 30 ).

1 . A method of brazing together two parts the method being characterized in that a pad is interposed between the two surfaces of the parts that are to be joined together, said pad being formed by a refractory fiber texture, and being at least in part in contact with a brazing composition, and heat treatment is performed to liquefy the brazing composition so as to cause the molten brazing composition to be distributed by capillarity over the entire brazing area between the two parts covered by the pad. 
   
   
       2 . A method according to  claim 1 , characterized in that at least one of the two parts is made of a ceramic matrix composite material, or a C/C composite material, or of a monolithic ceramic material. 
   
   
       3 . A method according to  claim 1 , characterized in that the pad is formed by a texture comprising carbon fibers, or by fibers of a carbon-precursor material, or by ceramic fibers. 
   
   
       4 . A method according to  claim 1 , characterized in that the brazing composition is placed in contact with at least a portion of the pad outside the docking zones of the surfaces of the parts to be brazed together. 
   
   
       5 . A method according to  claim 4 , characterized in that the brazing composition is placed in a crucible, the brazing composition being transported by capillarity by the pad between the surfaces of the parts that are to be joined together during the heat treatment. 
   
   
       6 . A method according to  claim 1 , characterized in that the thickness of the pad is selected as a function of the thickness of the brazed joint to be formed. 
   
   
       7 . A method according to  claim 1 , characterized in that the pad is cut to the dimensions and to the shapes of the surfaces of the parts for brazing together. 
   
   
       8 . A method according to  claim 1 , characterized in that, prior to the heat treatment step, an anti-wetting agent is applied to those portions of the parts that are not to be brazed together. 
   
   
       9 . A method according to  claim 1 , characterized in that one of the two parts for assembling together is in the form of a honeycomb or a waffle. 
   
   
       10 . A method according to  claim 1 , characterized in that the brazing composition is a silicon composition or a silicon-based composition, or a silicon alloy-based composition, or a metallic composition. 
   
   
       11 . A method according to  claim 2 , characterized in that the brazing composition is placed in contact with at least a portion of the pad outside the docking zones of the surfaces of the parts to be brazed together. 
   
   
       12 . A method according to  claim 3 , characterized in that the brazing composition is placed in contact with at least a portion of the pad outside the docking zones of the surfaces of the parts to be brazed together. 
   
   
       13 . A method according to  claim 11 , characterized in that:
 the brazing composition is placed in a crucible, the brazing composition being transported by capillarity by the pad between the surfaces of the parts that are to be joined together during the heat treatment;   the thickness of the pad is selected as a function of the thickness of the brazed joint to be formed;   the pad is cut to the dimensions and to the shapes of the surfaces of the parts for brazing together;   prior to the heat treatment step, an anti-wetting agent is applied to those portions of the parts that are not to be brazed together;   one of the two parts for assembling together is in the form of a honeycomb or a waffle;   the brazing composition is a silicon composition or a silicon-based composition, or a silicon alloy-based composition, or a metallic composition.   
   
   
       14 . A method according to  claim 12 , characterized in that:
 the brazing composition is placed in a crucible, the brazing composition being transported by capillarity by the pad between the surfaces of the parts that are to be joined together during the heat treatment;   the thickness of the pad is selected as a function of the thickness of the brazed joint to be formed;   the pad is cut to the dimensions and to the shapes of the surfaces of the parts for brazing together;   prior to the heat treatment step, an anti-wetting agent is applied to those portions of the parts that are not to be brazed together;   one of the two parts for assembling together is in the form of a honeycomb or a waffle;   the brazing composition is a silicon composition or a silicon-based composition, or a silicon alloy-based composition, or a metallic composition.